You didn't show your cfc function, but your syntax in your
cfinput is 100% correct. You can pass additional values to a cfc
via Autosuggest exactly as you've shown.
If CompanyNumber was already assigned a value on your form
page (using cfinput...haven't tried it with regular html), you only
need to set it up as an argument in your cfc.
I've yet to find a way to mimic the best use of the old HTML
select/option tag, where you would display CompanyNames in the drop
down but use CompanyNumber as the submit value. As far as I know,
Autosuggest can be populated with a one-dimensional array
only.